Re: 80 Chinese Academy of Sciences beauty research bully: there is only one way to crack the Big Dipper.
this is a typical application of the Beidou system, which is the migration of the Tibetan antelope, the Beidou system protects the wild animals; the fire in Greater Khingan Range, the Beidou system can provide service for the rescuers in the direction and direction; this is the Beidou system used for precise strike; this is the Beidou for Marine Fisheries and on the ocean. The means of communication and positioning are very small, with the Beidou satellite navigation, which can effectively protect the life and safety of the fishermen; this is the Beidou system used for large vehicle positioning and monitoring; this is the Beidou system for our precision agriculture, in the agricultural modernization, we can use the Beidou system very precise control; this is the Beidou. The system is used for our large container shipping and shipping.
these are only a very basic aspect of the application of the Beidou system. Here, I want to focus on the application of Marine Fisheries we have just seen. In this application, the Beidou system not only provides the functions of location, navigation and timing, but also provides communication functions. The fishermen can send SMS in the Beidou System on the sea and report peace. What is the use of communication functions? Here I want to quote a famous saying by Professor Parkinson, the father of the American GPS, who once praised the integrated function of the navigation and communication of the dipper: "it is not only to know where you are, but also where I am, how wonderful it is."
, then, what is the use of communication? Let me give you a simple example. Everyone has read "Robinson Crusoe". If one day, a person drifts to an isolated island, what can he do? If he chose GPS at this time, he could only know where he was and could not tell anyone to come to the rescue, so he could only survive on a desert island.
if we are using the Beidou system, the situation is completely different, we can not only know where we are, but also we can send our location to a square circle, hundreds of kilometers, hundreds of kilometers, or even thousands of miles away. Believe me, if you have chosen the Beidou Positioning System, you will soon be able to say goodbye to ~
with your GPS little partner on a rescue ship, and we have said so many Beidou systems are very good and useful, and why it seems that in life, it seems that all of us rarely seem to use a dipper, as if a little more GPS. The GPS satellite navigation and positioning system has been built about 20 years earlier than the Beidou system. The historical gap in the 20 year is not to be filled in one day and one day. The application and promotion of the GPS system are already very mature. For example, the cheapest GPS chip now may be about two dollars, and the chip price of the North bucket system is due to the cause of mass production. It may still be around 100 yuan. It can not be used to restrict the development of the Big Dipper, but it can not be used without restricting the main factors, and afraid to use it or not. This is the main reason that restricts the development of the Big Dipper.
Beidou system from birth to now, although it has been proved in many ways, precision and reliability is completely free of GPS navigation system, but people have all sorts of questions about the Beidou system. This is about 2011 about the news about 2011, the headline used by the media is "Tsinghua girls to break the dipper to the United States", or "Beidou hundreds of billions of investment floats" and so on, more sensational.
, is Beidou really so vulnerable? Of course not. In fact, the real unreliability is the GPS system. Because the GPS system is only open to the code of the people, and the GPS code of civil code is easy to change when the war is war. In order to guarantee the autonomy, the European Union has built the Galileo system. This is also true for us. In order to protect our reliability, our country began to build our own Beidou system.
then let's go back to Tsinghua girl to crack up the Big Dipper. Can she really crack the Big Dipper? Of course not. The work she did at that time actually cracked a pseudo code sequence of the Beidou's civilian code signal.
first, the Beidou System in the process of construction, we for compatibility and interoperability consideration, so our code design and GPS, Galileo are all in the same line, and there is no special design. We hope that the people of the whole world will be able to use the civilian code provided by the Beidou free of charge, not only the Chinese Beidou, but also the Beidou of the world.
so she wants to break this pseudo code sequence without encryption or special design. First of all, it has no technical difficulty. From a scientific point of view, it is a simple signal detection and estimation problem. And in fact, at the end of 2012, our country had announced our ICD, and the code of our people's code has been widely reported, telling everyone that we want global receiver vendors to use this ICD file to produce the corresponding Beidou receiver.
then she can't crack. Beidou, besides the civilian code, we all know that there are military codes. Can the army code be cracked? First of all, it is very difficult to crack the military code, because the military code has passed our encryption, and has passed our special design and so on. If you want to crack the military code system, we might have a little simpler way of thinking about developing a space-time shuttle, and it's good to go back to the beiden code design and eavesdrop by the side. This technical difficulty may be easier than you can technically solve the Beidou code.
, so we have to believe that our Beidou system is very easy to use, and is very stable.
recently my friend has been turning over the boat of friendship. As a research worker in the dipper, I think the boat of friendship with everyone should have gone out of wood. This has nothing to do with weight. It's only about the nature of work. But we believe that with the support of all of us, with the unremitting efforts of the big wheel of Beidou, we can continue to brave the wind and waves to the world. Thank you.